Microminiature CTCSS Encoder
Performed Work
- Hardware Design No
- Schematics Yes
- PCB Layout No
- Firmware Yes
- In Charge of Production No
- Company CSI (Closed on January 16, 2023)
- Year 1992
Description
More than 30 years ago, in 1992, living in Brazil, I wrote the firmware and designed the electrical schematics of the SS-64 Tone Encoder for the Communications Specialists Inc. Orange, CA. The firmware was written in HC05 assembly language. Files were delivered in a 1.44 floppy disk.
The product description extracted from CSI SS-64 datasheet is below:
The Communications Specialists Model SS-64 Miniature 64 Tone CTCSS Encoder is a microcontroller based product used for encoding sub audible tones.
The SS-64 is compatible with continuous tone controlled squelch systems (CTCSS) used in land mobile radio such as Private Line, Channel Guard, and Quiet Channel.
Because of its small size and low power consumption, advanced engineering has resulted in a product that is ideal for mobile and portable two-way FM radio installations.
Simple held programming by dip switch allows the user to set the CTCSS tone frequency.
Squelch tail elimination is achieved by the use of a reverse phase burst at the end of each transmission if enabled by jumper.
